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Heat released or absorbed by reaction at a constant pressure is the enthalpy. The endothermic process absorbs the heat(hint:endo meaning in) and the exothermic process (exo meaning out like export, get it)released the heat from its surroundings. "Heat of reaction, symbolized as ΔH, it is the amount of heat that must be added or removed during chemical reaction to keep substance present at same temperature.
A thermochemical equation, the enthalpy change, is shown of the reaction

In other terms Enthalpy refers to energy At Constant Pressure. It comes from the Greek word "Enthalpo" meaning warming up.

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This Is short preview of our own Heat of Reaction lab.

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Useful Sites for reference:

Lecture Help-By Clicking Here This is an External Link To Lecture Help. This is A very useful site when you need more practice/practice problems not only for this topic of chemistry but for others.

Energy Changes in Chemical Reactions-This site breaks down and help you understand more of the basics

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Example Problems:


As you can see above this is an example problem. We use the Dimensional Analysis to convert.